Experiences with Doulas

It seems we have a lot of great options for doulas in the area, so I'm a bit overwhelmed! I would love to hear from anyone who has used either Kaelie Harris or Jana Lynn Waters. I have heard great things about both and think I have narrowed my choices down to them, so I would love to hear from any ladies who have specifically used either. I plan to have a low intervention birth in the hospital. Is a doula worth the cost?

Thank you!